EP3432494B1 - Verfahren und vorrichtung zur ermöglichung von einzelfaserbearbeitung auf einer optischen faser - Google Patents

Verfahren und vorrichtung zur ermöglichung von einzelfaserbearbeitung auf einer optischen faser Download PDF

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Publication number
EP3432494B1
EP3432494B1 EP17181587.1A EP17181587A EP3432494B1 EP 3432494 B1 EP3432494 B1 EP 3432494B1 EP 17181587 A EP17181587 A EP 17181587A EP 3432494 B1 EP3432494 B1 EP 3432494B1
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Prior art keywords
data channels
frequency
wdm
wdm data
optical fiber
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French (fr)
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EP3432494A1 (de
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Sander Jansen
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Adva Optical Networking SE
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Adva Optical Networking SE
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Priority to US16/024,406 priority patent/US10615904B2/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0261—Optical medium access at the optical multiplex section layer
    • H04J14/0265—Multiplex arrangements in bidirectional systems, e.g. interleaved allocation of wavelengths or allocation of wavelength groups
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/25073—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion using spectral equalisation, e.g. spectral filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2543—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to fibre non-linearities, e.g. Kerr effect
    • H04B10/2563—Four-wave mixing [FWM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0208—Interleaved arrangements

Definitions

  • Single fiber-working, SFW, networks allow to reduce the number of required fibers in a system.
  • Various DWDM and CWDM SFW architectures are available. All conventional SFW architectures have in common that the transmit wavelength is different from the receive wavelength. It is necessary to transmit and receive a signal at a different wavelength because otherwise fiber reflections of the optical fiber can result in severe transmission penalties. This has in particular a negative impact on 100G+ transponders using coherent detection. Because of space and power restrictions, 100G+ transponders use the same laser on the transmission side and reception side. In dual fiber-working systems, this does not pose a restriction on its operation as the transmit and receive wavelength are typically the same. However, in a single fiber-working, SFW, system, the transmit and receive wavelength must be different and as such these 100G+ transponders cannot be used in a single fiber-working architecture.
  • US 2015/304036 A1 discloses a controller for generating higher fiber spectral efficiency without using high-order modulation formats including operating an interleaved bidirectional transmission IBT with sub-Nyquist optical regime exchange reach for spectral efficiency.
  • US 2013/315598 A1 discloses a system and a method for use in dense wavelength division multiplexing.
  • WO 2012/110081 A1 discloses a method for processing data in an optical network.
  • the present invention provides a method according to claim 1, an apparatus according to claim 15 and an optical network according to claim 17 for enabling a single fiber-working where data is transportable through a single optical fiber SOF which allows the use of dual fiber-working, DFW, transponders.
  • Further advantageous embodiments and improvements of the present invention are listed in the dependent claims.
  • the invention is defined by the attached claims, and any examples and embodiments not covered by these claims are also to be understood as aspects contributing to the understanding of the invention.
  • the invention provides according to the first aspect of the present invention a method for transporting data through a single optical fiber, SOF, comprising the steps of:
  • the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels are frequency shifted with a frequency shift of at least the Nyquist spectral bandwidth of the respective WDM data channels.
  • the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels are combined by interleaving the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels.
  • the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels are combined by coupling the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels by means of a passive optical interleaver or a passive optical coupler.
  • all transmission wavelength division multiplexed data channels and/or all reception wavelength division multiplexed data channels are frequency shifted simultaneously to avoid spectral overlap between the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels on said single optical fiber.
  • the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels are frequency shifted by a frequency shifter.
  • the transmission wavelength division multiplexed data channels are frequency upshifted by a frequency shifter on a transmission side of the single optical fiber to avoid spectral overlap between the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels.
  • the transmission wavelength division multiplexed data channels are frequency upshifted positively with a frequency shift by a first frequency shifter on a transmission side of said single optical fiber and frequency downshifted back negatively with the same frequency shift by a second frequency shifter on the reception side of said single optical fiber.
  • both the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels are frequency shifted relative to each other by a first frequency shifter on a transmission side of said single optical fiber and by a second frequency shifter on a reception side of said single optical fiber.
  • the frequency shift is realized by an IQ Mach-Zehnder modulator.
  • the frequency shift is realized by four-wave mixing in a highly non-linear fiber.
  • the frequency shift is realized by cascaded frequency shifting using a Chi2 non-linearity in periodically poled lithium niobate.
  • the frequency shift is adjusted in response to a control signal received from a network management system.
  • the transmission wavelength division multiplexed data channels are provided by transmit ports of multiple transponders and multiplexed or coupled to provide a first frequency spectrum forming a transponder frequency grid with frequency gaps between the transmission wavelength division multiplexed data channels.
  • the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels are combined to provide a second frequency spectrum forming a fiber frequency grid without frequency gaps between the wavelength division multiplexed data channels on said single optical fiber.
  • a frequency distance between two adjacent transmission wavelength division multiplexed data channels in the first frequency spectrum is at least twice the frequency distance between a transmission wavelength division multiplexed data channel and a reception wavelength division multiplexed data channel in the second signal spectrum on the single optical fiber.
  • the invention further provides according to a further aspect a SFW-apparatus for enabling a single fiber-working, SFW, where data is transportable through a single optical fiber, SOF, said SFW-apparatus comprising:
  • the frequency shift is realized by an IQ Mach-Zehnder modulator, by four-wave mixing in a highly non-linear fiber and/or by cascaded frequency shifting using Chi2 non-linearity in periodically poled lithium niobate.
  • the invention further provides according to a third aspect an optical network comprising network nodes connected to each other via a single optical fiber, SOF, wherein each network node of said optical network comprises an SFW-apparatus according to the second aspect of the present invention.
  • the method for transporting data through a single optical fiber SOF performed by a method according to the present invention comprises several main steps. As illustrated in Fig. 7 , the method can comprise in a possible embodiment four main steps S1, S2, S3, S4.
  • a first step S1 transmission, Tx, wavelength division multiplexed, WDM, data channels are provided as well as reception, Rx, wavelength division multiplexed, WDM, data channels having the same frequency grid with frequency gaps between the WDM data channels as also shown in Fig. 1 of the illustrated embodiment of the SFW-apparatus 1.
  • the Tx WDM data channels and/or the Rx WDM data channels are frequency shifted to avoid a spectral overlap between the transmission WDM data channels and the Rx WDM data channels.
  • a frequency shift can be realized in different ways.
  • the frequency shift can be realized by an IQ Mach-Zehnder modulator.
  • the frequency shift is realized by four-wave mixing in a highly non-linear fiber.
  • the frequency shift can be realized by cascaded frequency shifting using a Chi2 non-linearity in periodically poled lithium niobate.
  • the frequency shift can be performed in response to a control signal received from a network management system.
  • the transmission wavelength division multiplexed data channels and the reception wavelength division multiplexed data channels can be frequency shifted by a frequency shift of at least the Nyquist spectral bandwidth of the respective WDM data channels.
  • the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels are combined.
  • the frequency shifted Tx WDM data channels and the frequency shifted Rx WDM data channels are combined by interleaving the frequency shifted transmission wavelength division multiplexed data channels and the frequency shifted reception wavelength division multiplexed data channels.
  • the frequency shifted Tx WDM data channels and the frequency shifted Rx WDM data channels can be combined by coupling the frequency shifted Tx WDM data channels and the frequency shifted Rx WDM data channels by means of a passive optical interleaver or by means of a passive optical coupler.
  • step S3 After having combined the frequency shifted Tx WDM data channels and the frequency shifted Rx WDM data channels in step S3, data is transported via the combined WDM data channels in opposite directions through the single optical fiber SOF in step S4 as illustrated in Fig. 7 (signal spectrum SS3).
  • the single fiber-working, SFW, apparatus 1 enables a single fiber-working SFW where data is transportable through a single optical fiber SOF which can be connected to conventional transponders, in particular to dual fiber-working, DFW, 100G+ transponders as illustrated in the embodiments shown in Figs. 1 to 5 .
  • an SFW-apparatus 1 for enabling single fiber-working, SFW can comprise in the illustrated embodiment three main units.
  • the SFW-apparatus 1 comprises in the illustrated embodiment of Fig. 6 an optical transponder interface 2, a frequency shifter 3 and an optical combiner 4.
  • the optical transponder interface 2 is adapted to provide transmission, Tx, wavelength division multiplexed, WDM, data channels and reception, Rx, wavelength division multiplexed, WDM, data channels having the same frequency grid with frequency gaps between the WDM data channels.
  • the frequency shifter 3 of the SFW-apparatus 1 as shown in Fig. 6 is adapted to perform frequency shifting of the Tx WDM data channels and/or the Rx WDM data channels to avoid a spectral overlap between the Tx WDM data channels and the Rx WDM data channels.
  • the SFW-apparatus 1 further comprises in the illustrated embodiment an optical combiner 4 adapted to combine the frequency shifted Tx WDM data channels and the frequency shifted Rx WDM data channels for the single optical fiber, SOF, as shown in Fig. 6 .
  • the optical transponder interface 2 of the SFW-apparatus 1 can be connected to a number of transponders 5-1, 5-2 ... 5-n as shown in Fig. 6 .
  • the number of transponders 5-i connectable to the optical transponder interface can vary.
  • the transponders 5-i comprise DFW 100G transponders.
  • the Tx WDM data channels are provided by transmit ports of the multiple transponders 5-i and are multiplexed or coupled to provide a first frequency spectrum forming a transponder frequency grid with frequency gaps between the transmission wavelength division multiplexed data channels. Accordingly, at the optical transponder interface 2, the Tx WDM data channels comprise a transponder frequency grid with frequency gaps between the Tx WDM data channels.
  • the transponder frequency grid comprises frequency gaps with a 75 GHz spacing between the transmission WDM data channels as also illustrated as signal spectrum SS1 in Fig. 7 . Other spacings are possible, e.g. 50 GHz spacings between the data channels.
  • the transmission wavelength division multiplexed data channels with multiple transponders can be multiplexed or coupled to provide a first frequency spectrum (ongrid) with sufficient frequency gaps between the transmission WDM data channels.
  • a single optical fiber SOF connects two SFW-apparatus 1A, 1B with each other.
  • An SFW-apparatus can exchange bidirectly data via the SOF fiber.
  • a number of transponders can be connected as illustrated in Fig. 1 .
  • both apparatuses 1A, 1B comprise a 75 GHz AWG (Arrayed Waveguide Grating) forming part of the optical transponder interface 2 of the apparatuses 1A, 1B.
  • a first AWG 6A can be used as a multiplexer and a second AWG 7A can be used as a demultiplexer.
  • a first AWG 6A can be used as a multiplexer
  • a second AWG 7A can be used as a demultiplexer.
  • the WDM data channels of the transponder frequency grid having frequency gaps between the WDM data channels are shifted by a wavelength shifter 3A to avoid a spectral overlap between the Tx WDM data channels received from the transmit ports of the transponders 5A-i and the Rx WDM data channels received by the receive ports of the transponders 5A-i.
  • the Tx WDM data channels and the Rx WDM data channels transport data through the single optical fiber SOF in opposite directions.
  • the wavelength shifter 3A may shift the Tx WDM data channels by 37.5 GHz, i.e. half the frequency gap between the WDM Tx data channels as also shown as signal spectrum SS2 in Fig. 7 .
  • the frequency shifted Tx WDM data channels which have been frequency shifted by the frequency shifter 3A of the SFW-apparatus 1A are combined by an optical combiner 4A of the SFW-apparatus 1A with the frequency shifted Rx WDM data channels to provide a frequency spectrum SS3 as shown in Fig. 7 forming a fiber frequency grid without frequency gaps between the WDM data channels, i.e. the WDM Tx data channels and the WDM Rx data channels, on the single optical fiber SOF.
  • the combiner can comprise a 37.5 GHz interleaver. In the system shown in Fig.
  • the SFW-apparatus 1B on the other side of the single optical fiber SOF has the same structure as the SFW-apparatus 1A.
  • the SFW-apparatus 1B comprises an AFW multiplexer 6B, an AFW demultiplexer 7B, a frequency shifter 3B and an optical combiner 4B.
  • the frequency shifter 3B can also perform a wavelength or frequency shift of e.g. 37.5 GHz in the illustrated implementation.
  • the optical combiner 4B comprises in a possible embodiment a 37.5 GHz interleaver.
  • the transmit and receive ports of the transponders 5-i can be multiplexed independently in 75 GHz AWGs to form a signal spectrum SS1 as shown in Fig. 7 .
  • the signals can be fed in a possible embodiment to a polarization diverse frequency shifter 3A.
  • all Tx WDM data channels are frequency shifted simultaneously to avoid a spectral overlap between the Tx WDM data channels and the Rx WDM data channels on the single optical fiber SOF.
  • the WDM data channels are frequency shifted with half the channel's spacing, e.g. 37.5 GHz. This can be performed by the polarization diverse frequency shifter 3A as shown in Fig. 7 .
  • the WDM data channels are shifted from ongrid to offgrid.
  • the second signal spectrum SS2 shown in Fig. 7 shows the frequency shifted Tx WDM data channels shifted by 37.5 GHz, i.e. half the channel's spacing of the signal spectrum SS1.
  • the Tx and Rx data streams are merged together by a combiner with a 37.5 GHz interleaver resulting in a spectrum SS3 as shown in Fig. 7 .
  • This frequency spectrum SS3 forms a fiber frequency grid without frequency gaps between the WDM data channels on the single optical fiber SOF. Accordingly, the Tx WDM data channels and the Rx WDM data channels are located next to each other.
  • 64 100G+ transponders 5-i can be multiplexed together in a C-band occupying 128 WDM data channels at a 37.5 GHz grid.
  • the optical signal can be demultiplexed and frequency shifted again.
  • no further shift is performed on the far end side so that the WDM data channels received by the transponders 5B-i are offgrid.
  • the embodiment illustrated in Fig. 1 has the advantage that only one frequency shift is performed, however, it has the disadvantage that the transponders on the other remote side have to operate offgrid. By performing only one frequency shift on the transmission side, using the frequency shifter 3A, the penalty of the frequency shift is minimized.
  • This penalty can comprise non-linear signal distortions and/or a noise penalty and/or linear signal distortion and/or spectral attenuation. Accordingly, to minimize the impact of the frequency shifting, only one frequency shifter is used per direction as illustrated in the embodiment of Fig. 1 , 7 . In both directions of the system shown in Fig. 1 , a frequency shifter 3A, 3B is located at the transmit side. With the illustrated configuration of Fig. 1 , both directions comprise one frequency shifter resulting in a more equal performance in both directions.
  • a disadvantage of the architecture illustrated in Fig. 1 is that it is more difficult to manage the system as the transponders on the different sides of the single optical fiber SOF operate at different frequency grids spaced e.g.
  • the WDM channels on the left side of Fig. 1 connected to the SFW-apparatus 1A may operate ongrid whereas the WDM channels on the right side of Fig 1 connected to SFW-apparatus 1B are offgrid.
  • the Tx WDM data channels can be frequency upshifted by a first frequency shifter 3A on a transmission side of the single optical fiber SOF to avoid spectral overlap between the Tx WDM data channels and the Rx WDM data channels.
  • the Tx WDM data channels can be frequency upshifted positively with a predetermined frequency shift by a first frequency shifter 3A on the transmission side of the single optical fiber SOF and then frequency downshifted back negatively with the same frequency shift by a second frequency shifter 3B on the reception side of the single optical fiber SOF.
  • the first frequency shifter 3A on the transmission side performs an upshift of the WDM data channels by e.g. 37.5 GHz.
  • the second frequency shifter 3B on the reception side performs a downshift by the same frequency shift by e.g. 37.5 GHz.
  • the advantage of the embodiment illustrated in Fig. 2 is that the transponders 5 on both sides of the single optical fiber SOF use the same frequency grid (ongrid). This simplifies the management of the optical system significantly.
  • both the Tx WDM data channels and the Rx WDM data channels are frequency shifted relative to each other by a first frequency shifter 3A on a transmission side of a single optical fiber SOF and by a second frequency shifter 3B on a reception side of a single optical fiber SOF.
  • both SFW-apparatuses 1A, 1B comprise two frequency shifters, i.e. a first frequency shifter 3A for performing a positive frequency shift of the Tx WDM data channels and a negative frequency shift of the received WDM data channels.
  • a first frequency shifter 3A for performing a positive frequency shift of the Tx WDM data channels and a negative frequency shift of the received WDM data channels.
  • the first positive frequency shifter 3A1 of the SFW-apparatus 1A performs a positive wavelength or frequency shift by 18.75 GHz, i.e. a quarter of the 75 GHz spacing of the original signal spectrum.
  • the SFW-apparatus 1A further comprises a second negative frequency shifter 3A2 for performing a negative frequency shift of 18.75 GHz of the received Rx WDM data channels.
  • the SFW-apparatus 1B on the remote side has the same structure comprising a negative frequency shifter 3B2 and a positive frequency shifter 3B1.
  • the negative frequency shifter 3B2 performs a negative frequency shift of 18.75 GHz whereas the positive frequency shifter 3B1 performs a positive frequency shift of also 18.75 GHz in a possible embodiment.
  • each SFW-apparatus 1 comprises a positive shifter and a negative frequency shifter.
  • the transmission system as illustrated in the embodiments of Figs. 1 , 2 , 3 is configured to operate over a complete C-band with sufficient efficiency.
  • the frequency shift can be performed in a possible embodiment by four-wave mixing FWM in a highly non-linear fiber HNLF.
  • the main challenge of FWM in HNLF is that HNLF is bulky and that high optical powers are required for FWM generation. Similar high powers are required for Chi2 in a PPLN (Periodically Poled Lithium Niobate).
  • PPLN forms a fragile device that needs to be heated. Accordingly, in a preferred embodiment, an IQ Mach-Zehnder modulator can be used for frequency shifting.
  • the frequency shift of the signal spectrum of one of the two opposite signal transport directions with half of the channel grid is performed before combining the channels.
  • the Tx and Rx WDM data channels are interleaved and are provided at the respective other side where the WDM data channels are converted back for detection.
  • the architecture according to the present invention comprises a significant lower complexity than a system using separate local oscillators for each transponder. Further, high-density transmission systems have demanding space and power consumption requirements. Saving the need for a local oscillator eases the space and power requirements of the signal transport system. Further, most transmission systems are DFW systems and as such it is efficient to provide a separate transponder architecture for single fiber-working SFW.
  • standard DFW transponders can be used on a single fiber-working, SFW, optical network.
  • the method according to the present invention has the further advantage that it is completely independent of the modulation format, protocol and used data rates. Accordingly, the system implementing the method according to the present invention can be used for many generations of transponders.
  • Fig. 4 shows a schematic diagram for illustrating a possible application of the method and apparatus according to the present invention.
  • the method and apparatus according to the present invention allows point-to-point communication from a point P to a point Q in a network.
  • the SFW-apparatus 1 according to the present invention is located in a central office and can be connected via a single optical fiber SOF to other points Q1...Qn by means of associated add drop sites.
  • the signal spectrum at the add drop site is illustrated in Fig. 4 as well.
  • Fig. 5 shows a further use case for implementing the method and apparatus 1 according to the present invention.
  • the method can be used for connecting a central office with other nodes in a ring network.
  • Each network node comprises at least one SFW-apparatus 1 connected by means of an add drop site as shown in Fig. 5 .
  • the frequency shifting performed by the frequency shift units within the different SFW-apparatuses can be controlled by a network management system, for instance by means of a DCN (Dynamic Circuit Network) connection.
  • the method and apparatus 1 according to the present invention can be used for a hub and spoke ring network or for linear add drop networks.
  • the number of WDM channels and the spacing in the frequency's grid can vary depending on the use case.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Claims (17)

  1. Verfahren zum Transportieren von Daten durch einen einzelnen Lichtwellenleiter (Single Optical Fiber - SOF) in zwei Richtungen zwischen einer ersten Station und einer zweiten Station, wobei sich die erste und die zweite Station auf gegenüberliegenden Enden des einzelnen Lichtwellenleiters (SOF) befinden, wobei das Verfahren die Schritte umfasst zum:
    (a) Bereitstellen (S1) von Datenkanälen für eine wellenlängengemultiplexte Sendung, Tx-WDM, in der ersten Station zum Senden von Daten an die zweite Station und von Datenkanälen für einen wellenlängengemultiplexten Empfang, Rx-WDM, in der ersten Station zum Empfangen von Daten von der zweiten Station, die das gleiche Frequenzraster mit Frequenzlücken zwischen den WDM-Datenkanälen aufweisen,
    gekennzeichnet durch die Schritte zum
    (b) Frequenzverschieben (S2) in der ersten Station der Tx-WDM-Datenkanäle und/oder der eingehenden Rx-WDM-Datenkanäle, um eine spektrale Überlappung zwischen den Tx-WDM-Datenkanälen und den Rx-WDM-Datenkanälen zu vermeiden;
    (c) Kombinieren (S3) der Tx-WDM-Datenkanäle und der Rx-WDM-Datenkanäle, wobei die Tx-WDM-Datenkanäle und/oder die Rx-WDM-Datenkanäle in Schritt (b) frequenzverschoben werden; und
    (d) Transportieren (S4) von Daten über die kombinierten WDM-Datenkanäle durch den einzelnen Lichtwellenleiter (SOF) in entgegengesetzte Richtungen.
  2. Verfahren nach Anspruch 1, wobei die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle gleichzeitig mit einer Frequenzverschiebung von mindestens der spektralen Nyquist-Bandbreite der jeweiligen WDM-Datenkanäle frequenzverschoben werden.
  3. Verfahren nach Anspruch 1 oder 2, wobei die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle kombiniert (S3) werden, indem die frequenzverschobenen Tx-WDM-Datenkanäle und die frequenzverschobenen Rx-WDM-Datenkanäle verschachtelt werden, wobei die Tx-WDM-Datenkanäle und/oder die Rx-WDM-Datenkanäle in Schritt (b) frequenzverschoben werden.
  4. Verfahren nach Anspruch oder 3, wobei die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle kombiniert (S3) werden, indem die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle mittels eines passiven optischen Verschachtelers oder eines passiven optischen Kopplers gekoppelt werden, wobei die Tx-WDM-Datenkanäle und/oder die Rx-WDM-Datenkanäle in Schritt (b) frequenzverschoben werden.
  5. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 4, wobei alle Tx-WDM-Datenkanäle und/oder alle Rx-WDM-Datenkanäle gleichzeitig frequenzverschoben (S2) werden, um eine spektrale Überlappung zwischen den Tx-WDM-Datenkanälen und den Rx-WDM-Datenkanälen auf dem einzelnen Lichtwellenleiter (SOF) zu vermeiden.
  6. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 5, wobei die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle durch einen Frequenzschieber frequenzverschoben (S2) werden.
  7. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 6, wobei die Tx-WDM-Datenkanäle durch einen Frequenzschieber auf der Sendungsseite des einzelnen Lichtwellenleiters (SOF) nach oben frequenzverschoben werden, um eine spektrale Überlappung zwischen den Tx-WDM-Datenkanälen und den Rx-WDM-Datenkanälen zu vermeiden.
  8. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 7, wobei die Tx-WDM-Datenkanäle durch einen ersten Frequenzschieber auf der Sendungsseite des einzelnen Lichtwellenleiters (SOF) mit einer Frequenzverschiebung positiv nach oben frequenzverschoben werden und durch einen zweiten Frequenzschieber auf der Empfangsseite des einzelnen Lichtwellenleiters (SOF) mit der gleichen Frequenzverschiebung negativ nach unten frequenzverschoben werden.
  9. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 6, wobei sowohl die Tx-WDM-Datenkanäle als auch die Rx-WDM-Datenkanäle durch einen ersten Frequenzschieber auf der Sendungsseite des einzelnen Lichtwellenleiters (SOF) und durch einen zweiten Frequenzschieber auf der Empfangsseite des einzelnen Lichtwellenleiters (SOF) relativ zueinander frequenzverschoben werden.
  10. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 9, wobei die Frequenzverschiebung realisiert wird durch einen IQ-Mach-Zehnder-Modulator,
    durch Vierwellenmischung in einer hochgradig nichtlinearen Faser und/oder
    durch kaskadierte Frequenzverschiebung unter Verwendung einer Chi2-Nichtlinearität in periodisch gepoltem Lithiumniobat.
  11. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 10, wobei die Frequenzverschiebung als Reaktion auf ein Steuersignal eingestellt wird, das von einem Netzwerkverwaltungssystem empfangen wird.
  12. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 11, wobei die Tx-WDM-Datenkanäle durch Sendeanschlüsse mehrerer Transponder bereitgestellt und gemultiplext oder gekoppelt werden, um ein erstes Frequenzspektrum bereitzustellen, das ein Transponder-Frequenzraster mit Frequenzlücken zwischen den Tx-WDM-Datenkanälen bildet.
  13. Verfahren nach einem der vorhergehenden Ansprüche 1 bis 12, wobei die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle kombiniert werden, um ein zweites Frequenzspektrum bereitzustellen, das ein Faser-Frequenzraster ohne Frequenzlücken zwischen den WDM-Datenkanälen auf dem einzelnen Lichtwellenleiter (SOF) bildet, wobei die Tx-WDM-Datenkanäle und/oder die Rx-WDM-Datenkanäle in Schritt (b) frequenzverschoben werden.
  14. Verfahren nach Anspruch 13, wobei ein Frequenzabstand zwischen zwei benachbarten Tx-WDM-Datenkanälen in dem ersten Frequenzspektrum mindestens doppelt so groß wie der Frequenzabstand zwischen einem Tx-WDM-Datenkanal und einem Rx-WDM-Datenkanal in dem zweiten Signalspektrum auf dem einzelnen Lichtwellenleiter (SOF) ist.
  15. SFW-Vorrichtung zur Ermöglichung einer Einzelfaserbearbeitung, SFW, wobei Daten durch einen einzelnen Lichtwellenleiter (SOF) in zwei Richtungen zwischen einer ersten und einer zweiten Station transportierbar sind, wobei sich die erste und die zweite Station auf gegenüberliegenden Enden des einzelnen Lichtwellenleiters (SOF) befinden, wobei die SFW-Vorrichtung (1) umfasst:
    (a) eine optische Transponder-Schnittstelle (2), die ausgelegt ist, um Datenkanäle für eine wellenlängengemultiplexte Sendung, Tx-WDM, in der ersten Station zum Senden von Daten an die zweite Station und Datenkanäle für einen wellenlängengemultiplexten Empfang, Rx-WDM, in der ersten Station zum Empfangen von Daten von der zweiten Station, die das gleiche Frequenzraster mit Frequenzlücken zwischen den WDM-Datenkanälen aufweisen, bereitzustellen;
    gekennzeichnet durch
    (b) einen Frequenzschieber (3) in der ersten Station, der ausgelegt ist, um ein Frequenzverschieben der Tx-WDM-Datenkanäle und/oder der eingehenden Rx-WDM-Datenkanäle durchzuführen, um eine spektrale Überlappung zwischen den Tx-WDM-Datenkanälen und den Rx-WDM-Datenkanälen zu vermeiden; und
    (c) einen optischen Kombinierer (4), der ausgelegt ist, um die Tx-WDM-Datenkanäle und die Rx-WDM-Datenkanäle für den einzelnen Lichtwellenleiter (SOF) zu kombinieren, wobei die Tx-WDM-Datenkanäle und/oder die Rx-WDM-Datenkanäle durch den Frequenzschieber (3) frequenzverschiebbar sind.
  16. SFW-Vorrichtung nach Anspruch 15, wobei die Frequenzverschiebung realisiert wird durch einen IQ-Mach-Zehnder-Modulator, durch Vierwellenmischung in einer hochgradig nichtlinearen Faser und/oder durch kaskadierte Frequenzverschiebung unter Verwendung einer Chi2-Nichtlinearität in periodisch gepoltem Lithiumniobat.
  17. Optisches Netzwerk, umfassend Netzwerkknoten, die miteinander über einen einzelnen Lichtwellenleiter (SOF) verbunden sind, wobei jeder Netzwerkknoten des optischen Netzwerks eine SFW-Vorrichtung (1) nach Anspruch 15 oder 16 umfasst.
EP17181587.1A 2017-07-17 2017-07-17 Verfahren und vorrichtung zur ermöglichung von einzelfaserbearbeitung auf einer optischen faser Active EP3432494B1 (de)

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US16/024,406 US10615904B2 (en) 2017-07-17 2018-06-29 Method and apparatus for enabling a single fiber-working on an optical fiber

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